I came up with an idea for a little container, using the large (Jack Stone) trans-clear panel piece - it's called a MOCBox, and here are a few (okay, ten):

The MOCBox is very easy to make, and is also quite versatile. It can be made to stand on its own, lean like a picture frame, or even hang on a wall. By varying the orientation and depth of the MOCBox, you can create your own design, and decorate it to your liking. In these examples, I have made micro-scenes, artwork, and vignettes as MOCBoxes, even decorating the exteriors on a few. The last one also shows how you can combine MOCBoxes to form a larger one, much like a vignette. It's a very cool way to display your minifigs, rare parts, etc.